Update Fermi 3FHL catalog: 1,558 hard gamma-ray sources

README.md

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+---
+license: cc-by-4.0
+pretty_name: "Fermi LAT Third Catalog of Hard Sources (3FHL)"
+language:
+  - en
+description: "1,556 gamma-ray sources detected above 10 GeV by Fermi LAT over 7 years, bridging the GeV-TeV energy gap."
+task_categories:
+  - tabular-classification
+tags:
+  - space
+  - gamma-ray
+  - fermi
+  - nasa
+  - tev
+  - high-energy
+  - astronomy
+  - open-data
+  - tabular-data
+size_categories:
+  - 1K<n<10K
+configs:
+  - config_name: default
+    data_files:
+      - split: train
+        path: data/fermi-3fhl.parquet
+    default: true
+---
+
+# Fermi LAT Third Catalog of Hard Sources (3FHL)
+
+*Part of the [Astronomy Datasets](https://huggingface.co/collections/juliensimon/astronomy-datasets-69c24caf2f17e36128946743) collection on Hugging Face.*
+
+Gamma-ray sources detected above 10 GeV by the Fermi Large Area Telescope (LAT)
+over 7 years of observation. Currently **1,558** sources with 67 attributes each.
+
+## Dataset description
+
+The 3FHL catalog (Ajello et al. 2017) contains sources detected by Fermi LAT in the
+10 GeV - 2 TeV energy range using 7 years of Pass 8 data. This catalog bridges the gap
+between the GeV regime covered by the standard Fermi catalogs and the TeV regime
+covered by ground-based Cherenkov telescopes (H.E.S.S., MAGIC, VERITAS).
+
+Sources include blazars, pulsar wind nebulae, supernova remnants, and unidentified
+gamma-ray emitters. The catalog is essential for planning observations with current
+and future TeV observatories like CTA.
+
+## Quick stats
+
+- **1,558** gamma-ray sources above 10 GeV
+
+## Usage
+
+```python
+from datasets import load_dataset
+
+ds = load_dataset("juliensimon/fermi-3fhl-hard-gamma-ray", split="train")
+df = ds.to_pandas()
+
+# Highest significance sources
+print(df.head(10)[["name", "ra", "dec"]])
+
+# Sky map
+import matplotlib.pyplot as plt
+plt.figure(figsize=(12, 6))
+plt.scatter(df["ra"], df["dec"], s=2, alpha=0.5)
+plt.xlabel("RA (deg)")
+plt.ylabel("Dec (deg)")
+plt.title("Fermi 3FHL Sources (>10 GeV)")
+plt.gca().invert_xaxis()
+```
+
+## Data source
+
+All data comes from the [Fermi 3FHL Catalog](https://heasarc.gsfc.nasa.gov/W3Browse/fermi/fermi3fhl.html)
+hosted by NASA's High Energy Astrophysics Science Archive Research Center (HEASARC),
+accessed via the TAP protocol.
+
+Reference: Ajello, M. et al. 2017, ApJS, 232, 18.
+
+## Related datasets
+
+- [gamma-ray-bursts](https://huggingface.co/datasets/juliensimon/gamma-ray-bursts) — Fermi GBM Gamma-Ray Burst Catalog
+- [pulsar-catalog](https://huggingface.co/datasets/juliensimon/pulsar-catalog) — ATNF Pulsar Catalogue
+
+## Pipeline
+
+Source code: [juliensimon/space-datasets](https://github.com/juliensimon/space-datasets)
+
+## Citation
+
+```bibtex
+@dataset{fermi_3fhl,
+  author = {Simon, Julien},
+  title = {Fermi LAT Third Catalog of Hard Sources (3FHL)},
+  year = {2026},
+  publisher = {Hugging Face},
+  url = {https://huggingface.co/datasets/juliensimon/fermi-3fhl-hard-gamma-ray},
+  note = {Based on Fermi 3FHL (Ajello et al. 2017) via NASA HEASARC}
+}
+```
+
+## License
+
+[CC-BY-4.0](https://creativecommons.org/licenses/by/4.0/)

data/fermi-3fhl.parquet

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